The TenCate Geotube® technology was used for treatment and dewatering of the sludge accumulated in a lagoon dedicated to urban effluent treatment. The first lagoon had high levels of solids so a fast and effective action was required! Geotube® technology allows high levels of dry matter, providing a significant reduction of the sludge volume to be managed, a considerable reduction in economic costs as well as a reduced footprint, thus contributing positively to this kind operation: cleaning and removal sludge from ponds in public WWTP.